DE3415555A1 - Chair - Google Patents

Abstract

The invention relates to a chair which can be pivoted from a normal seat position into a reclined position of rest with a seat surface pivoted downwards and a backrest pivoted rearwards and can be pivoted back into the seat position again from this reclined position of rest. The seat surface of this novel chair consists of a front part, which is firmly connected to the underframe, and a rear part which adjoins said front part and can be pivoted downwards about a horizontal axis. The backrest consists of an upper part and a lower part which is linked to said upper part and is connected in an articulated manner at the bottom to the rear end of the seat surface. The rear end of a four-bar linkage, consisting of four limbs which are connected in an articulated manner, is connected with angular rigidity to the upper part of the backrest. The diagonally opposite joint is arranged in the vicinity of the rear end of the front part of the seat surface. As a result, an ergonomically correct "rolling" of the spinal column is achieved in the transition from the normal seat position into the reclined position of rest and likewise an ergonomically favourable sequence of movement of the spinal column, in particular in the lumbar region, when pivoting back from the position of rest into the seat position.

Description

Applicant: H.W.Schmidt GmbH Metallwarenfabrik, Bergstrasse 1, 473o Ahlen

chair

The invention relates to a chair that moves from a normal sitting position to a reclined rest position with the seat swiveled down and the backrest swung back and leaning back from it Rest position can be pivoted back into the sitting position.

Conventional chairs already have a variety of adjustment functions, such as lowering the seat surface and the adjustment of the back surface, dependent and also independent of each other.

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However, none of the known constructions enables the curve to be changed from the upright sitting posture (Lordosis) to the reclined sitting posture (kyphosis).

Based on the consideration that the curve of the user's spine when transitioning from the upright Sitting posture to the reclined sitting posture is desirable, it is the object of the invention when moving from a sitting posture in a different sitting posture the support point in a favorable for the seated person. V / eise to change.

In the case of a chair, this task is the one mentioned at the beginning Type solved by a combination of the following, partly individually known features:

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.__. a) The seat consists of two articulated joints Parts, a front part firmly connected to the underframe and an adjoining to it a first horizontal axis pivotable downward rear part;

b) the backrest consists of two parts, an upper part of the backrest and one hinged to it and against the upper part of the backrest, which can be pivoted about a second horizontal axis and which is in its lower area with the rear area of the rear part of the seat around a third horizontal axis is pivotably and slidably articulated;

c) with the upper part of the backrest and the seat surface a four-bar linkage is connected, each one in the seated position substantially horizontal first leg and arranged below the second leg, which is also with the underframe is firmly connected, as well as one of the front edge areas of the first and second legs each a third leg connecting an articulated connection and one over the rear end regions of the quadrangular articulation each has a fourth leg connecting an articulated connection;

d) the rear end of the upper first leg of the joint. Quadrilateral is rigidly and angularly connected to the lower end area of the upper part of the backrest, and the front end of the lower second leg and the lower end of the third leg are in the vicinity of the first horizontal axis around which the rear part of the seat surface is relative to the front part of the seat surface is pivotable, articulated to the front part of the seat surface, the lower, second leg as a rigid support carries the articulated connections to the front third leg and to the rear fourth leg.

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It has been shown that through simultaneous use the above-mentioned measures when changing from the upright sitting position to the leaning back Sitting posture or opposite transition, an ergonomically correct sequence of movements for the seated person is effectively supported.

In some cases it can be expedient to arrange one or more springs in such a way that the pivoting, preferably the first region of the pivoting of the seat surface to the rear, takes place against spring force.

Further developments and refinements of the invention are and will be characterized in the subclaims . hereinafter in connection with a partially schematically simplified figure showing an exemplary embodiment described.

The figure shows with full lines a chair designed according to the invention in the rest position, and the position of the moving parts of the chair in the reclined rest position is shown with dashed lines, both in side view.

The chair essentially consists of a chair with castors provided fixed base 3, a seat 4 ·, the from a front part A-A attached to the base 3 and a rear part 4-B, and a backrest 5, which consists of a lower part 5A and an upper part 5B, as well as a quadrilateral joint consisting of two legs that are essentially horizontal in the sitting position,

namely a first leg 6, a second leg 7, a third leg 8 connecting the front edge areas of the first leg 6 and the second leg 7 and finally a fourth leg 9 connecting the rear end areas of the first leg 6 and the second leg 7. The limbs 8 and 9 are connected to the limb 7 by means of articulated connections A and B and the limbs 6, 8, 9 are connected to one another by means of articulated connections C and D. The legs 6, 7, 8, 9, which form approximately a trapezoid in the seated position, can thereby be pivoted into other square shapes in the plane of this trapezoid.

The front part AA of the seat A- is rigidly connected to the underframe 3, the rear seat AB is hinged to the front part AA of the seat so that it can pivot about the axis X. The third leg 8 and the second leg 7 are articulated via the articulated connection A on the front part AA of the seat surface in the vicinity of the axis X. The first shank 6 of the joint square is rigidly and angularly connected at its rear end to the lower end region of the upper part 5B of the backrest, so that when the joint square of the legs 6, 7, 8, 9 is pivoted , the angle oC between the longitudinal direction of the first leg 6 and the longitudinal direction of the upper part 5B remains unchanged. The connection between the first leg 6 and the fourth leg 9 is made by the articulated connection C. The parts 5A and 5B of the backrest 5 are connected to one another so that they can pivot about the axis Y.

When the chair is reclined from the normal sitting position to the one indicated by broken lines Pivoted rest position, then the rear part A-B

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the seat surface about the axis X downwards into the position 4B shown with broken lines. Since the rear part 4B of the seat surface is connected to the lower part 5A of the backrest 5 so as to be rotatable about the axis Z and slidable in the direction of the arrow 10, the lowering of the rear end of the rear part of the seat surface 4B also causes the upper end of the rear part 5A of the backrest 5 is lowered and brought into the ^{position indicated by 5A 1} , so that the axis Y is displaced ^{into the position Y 1 shown in the figure.}

The two legs 6 and 8 of the quadrangle are thereby ^{pivoted or shifted into the positions 6 'and 8 1 shown} with broken lines and thus the joint connections C and D are brought into the positions C ¹ and D ^{1 shown} in the figure. Since the upper part 5B of the backrest 5 is connected to the leg 6 at a rigid angle, the angle β between the parts 5A and 5B of the backrest 5 is significantly changed in the course of the lowering of the rear seat surface, in the illustrated embodiment by about 60 degrees. The convex shape of the side of the backrest 5 facing the user can change into a concave shape when it is lowered into the reclined position of rest. During the lowering of the rear part of the seat surface, the convexly curved zone (central angle β approx. 200 °) in the area facing the lumbar vertebra of the user changes from a slightly convex position via a straight position into a slightly concavely curved zone (central angle ji ' approx. 140 °).

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This results in an ergonomically correct "unrolling" of the Spine achieved during the transition from the normal sitting position to the reclined resting position and likewise an ergonomically favorable sequence of movement of the spine, especially in the area of the lumbar vertebrae, when swiveling back from the rest to the sitting position.

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Claims (1)

Claims Chair that moves from a normal sitting position to a reclined position of rest with the swiveled down Seat and backrest pivoted backwards and from this reclined rest position back into - the seat position can be swiveled back, characterized by the combination of the following technical features: a) the "seat (4) consists of two articulated with each other connected parts, one with the base (3) firmly connected front part (4A) and an adjoining part around the first horizontal axis (X) downwardly pivotable rear part (4B); b) the backrest (5.) consists of two parts, an upper part (5B) of the "backrest (5) and one on it hinged and against the upper part (5B) about the second horizontal axis (Y) pivotable lower Part (5A) of the backrest, which is in its lower area with the rear area of the rear part (4B) of the seat surface (4) pivotably and displaceably articulated about the third horizontal axis (Z) is; c) with the upper part (5B) of the backrest (5) and the The seat (4) is connected to a four-bar linkage (6, 7, 8, 9), each of which is essentially in the seated position horizontal first leg (6) and arranged below the second leg (7), the . is firmly connected to the underframe (3), as well as one of the front edge regions of the first and second EPO COPY M - ζ "- '"' 34Τ5555 Leg via a respective articulated connection (A, D) connecting third leg (8) and the rear one End areas of the quadrilateral joint via a fourth leg (9) each connecting a joint (B, C) Has; d) the rear end of the upper first leg (6) of the quadrilateral joint is rigid and angularly rigid with the lower one End portion of the upper part (5B) of the backrest (5) connected, and the front end of the lower second leg (7) and the lower end of the third leg (8) are near the first horizontal Axis (X) around which the rear part (4B) of the seat surface (4) is relative to the front part (4A) of the seat surface (4) is pivotable, hinged to the front part (4A) of the seat surface (4), the lower second Leg (7) as a rigid support, the articulated connections (A, B) to the front third leg (8) and -to the rear fourth leg (9) carries. 20th . 2. Chair according to claim 1, characterized in that the first horizontal axis (X) of the rear pivotable Part (4B) of the seat (4) and the axis of the third, the second leg (7) with the third leg (8) connecting articulated connection (A) are aligned with each other. 3. Chair according to claim 1, characterized in that it contains two hinge quadrilaterals, one on each side of the Seat (4) and the backrest (5). 4. Chair according to claim 1, characterized in that the front of the backrest (5), which is convexly curved in the sitting position, is changed when pivoting into the reclined rest position so that the angle (β) between the upper part (5B) and the lower part (5A ) the backrest (5) is changed and the convexity is reduced. EPO COPY 5. Chair according to claim 1, characterized in that the front of the backrest (5), which is convexly curved in the sitting position, when pivoted into the leaned back Resting position over a stretched position merges into a concave curved end position. 5 6. Chair according to claim 4 or 5, characterized in that the front of the backrest (5) in the seated position is curved by a central angle (β) of at least 190 °, preferably about 200 °. 7. Chair according to claim 5, characterized in that in the reclined position of rest the front side of the backrest (5) is ^{curved by a central angle (ß 1} ) of less than 180 °, preferably about 140 °. 8. Chair according to claim 1, characterized by such an arrangement and at least one measurement Spring that at least the first phase of the pivoting of the rear part (4B) of the seat surface (4) backwards against the force of a spring. EPO COPY